Alert archive / Iowa / Dense Fog Advisories in 2021
Dense Fog Advisory 5, NWS Quad Cities, IA
NWS Quad Cities, IA issued this dense fog advisory at Feb 3, 2021, 1:04 AM CST for 21 counties in Iowa; 11 counties in Illinois; Clark County, Scotland County, Missouri. It was in force for 10 hr.
The area
The counties it named.
The facts
- Issued
- Feb 3, 2021, 1:04 AM CST (07:04 UTC)
- Expired
- Feb 3, 2021, 11:00 AM CST
- In force
- 10 hr
- Issued by
- NWS Quad Cities, IA
All 34 counties
Benton County, IA, Buchanan County, IA, Cedar County, IA, Clinton County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Washington County, IA, Bureau County, IL, Carroll County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Mercer County, IL, Putnam County, IL, Rock Island County, IL, Stephenson County, IL, Whiteside County, IL, Clark County, MO, Scotland County, MO
The radar
The Quad Cities radar (KDVN), 41 km from the middle of the area, began a volume at 07:10 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 7.1 hours before the alert went out and 47 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1014 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 32 m²/s²
- 0-3 km storm-relative helicity
- 65 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this dense fog advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Quad Cities, IA wrote its last area forecast discussion before this dense fog advisory went out at Feb 2, 10:21 PM CST, 2 hours 43 minutes earlier.
Area forecast discussion, Feb 2, 10:21 PM CST, 2 hours 43 minutes before
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</html>Hazardous weather outlook, Feb 2, 3:52 PM CST, 9 hours 12 minutes before
Hazardous Weather Outlook National Weather Service Quad Cities IA IL 352 PM CST Tue Feb 2 2021 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-032200- Buchanan-Delaware-Dubuque-Benton-Linn-Jones-Jackson-Iowa-Johnson- Cedar-Clinton-Muscatine-Scott-Keokuk-Washington-Louisa-Jefferson- Henry IA-Des Moines-Van Buren-Lee-Jo Daviess-Stephenson-Carroll- Whiteside-Rock Island-Henry IL-Bureau-Putnam-Mercer-Henderson- Warren-Hancock-McDonough-Scotland-Clark- 352 PM CST Tue Feb 2 2021 This Hazardous Weather Outlook is for portions of north central Illinois...northwest Illinois...west central Illinois...east central Iowa...northeast Iowa...southeast Iowa and northeast Missouri. .DAY ONE...THIS AFTERNOON AND TONIGHT Areas of fog, some dense, can be expected tonight reducing visibilities to less than a mile. There may also be patchy slick spots on roadways. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY Thursday, freezing rain and rain will spread across the entire area in the morning hours, with slick roads likely. By afternoon, a powerful cold front will quickly change the rains to snow, with accumulating snow likely through the evening hours. At this time, several inches of snow is possible, mainly along and north of Interstate 80. Blowing snow and rapidly falling temperatures in the late afternoon and evening will also be accompanied by a flash freeze of wet roads. Blowing snow will continue to be a threat through Thursday night, as temperatures fall to the single digits above zero to the lower teens. Wind chills by Friday morning may reach as low as -20. Bitterly cold weather is forecast through Monday. Wind chills of -20 to -30 are likely each night, with daytime highs only in the single digits above zero. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed through tonight. Haase
In the hours before
Special weather statement, Feb 2, 9:09 PM CST, 3 hours 55 minutes before
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</html>Special weather statement, Feb 2, 10:31 PM CST, 2 hours 33 minutes before
Special Weather Statement National Weather Service Quad Cities IA IL 1031 PM CST Tue Feb 2 2021 IAZ042-053-054-066-068-ILZ001-002-007-009-015>018-030645- Dubuque-Jones-Jackson-Clinton-Scott-Jo Daviess-Stephenson-Carroll- Whiteside-Rock Island-Henry IL-Bureau-Putnam- Including the cities of Dubuque, Anamosa, Maquoketa, Clinton, Davenport, Bettendorf, Galena, Freeport, Mount Carroll, Sterling, Moline, Rock Island, Geneseo, Princeton, and Hennepin 1031 PM CST Tue Feb 2 2021 ...Patchy Dense Fog... Clearing skies and light winds will continue to allow areas of fog to develop into the overnight. The fog will be dense in spots, especially in river valleys and other low lying areas. The patchy nature of the fog is likely to result in rapid fluctuations in visibility over short distances. If traveling be prepared for sudden changes in visibility. When encountering dense fog please use low beam headlights, slow down, and give yourself plenty of braking distance. A dense fog advisory may be needed if the dense fog becomes widespread.
The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 3, 4:01 AM CST | Winter Storm Watch | DVN | Benton, Buchanan, Cedar, Clinton, Delaware, Dubuque and 7 more | 11 hr |
| Feb 3, 4:01 AM CST | Winter Weather Advisory | DVN | Benton, Buchanan, Cedar, Clinton, Delaware, Des Moines and 15 more | 56 hr |
| Feb 3, 2:56 PM CST | Winter Storm Warning | DVN | Benton, Buchanan, Cedar, Clinton, Delaware, Des Moines and 13 more | 36 hr |
Nearby
Dense Fog Advisories in Iowa, 2021Dense Fog Advisories in Illinois, 2021Dense Fog Advisories in Missouri, 2021Every dense fog advisory in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.